Improvement in machines for trimming wooden boxes



J. BOZORTH. Machine for TrimmingWooden Boxes.

No. 213,734. Patented April I, 1879.

m E 3E2 1 lg El MPFI'ERS, PHOTO-UDIOGRAPHER, WKSWNQ GM E 9' .UNITEDSTATES PATENT OFFICE.

JOHN BOZORTH, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN MACHINES FOR TRIMMING WOODEN BOXES.

Specification forming part of Letters Patent No. 2l3,734, dated April 1,1879; application filed December 10, 1878.

To all whom it may concern:

Be it known that I, JOHN BOZORTH, of Philadelphia, county ofPhiladelphia, and State of Pennsylvania, have invented a new and usefulImprovement in Machines for Trimming Wooden Boxes, which improvement isfully set forth in the following specification and accompanyingdrawings, in which- Figure 1 is a front view of the machine. Fig. 2 is asectional elevation 011 line my. Figs. 3, 4, 5, and 6 are parts of theplane in detail.

This machine is for dressing or planing 0d the projecting ends of theboards forming the top, bottom, and sides of wooden boxes. After thebox'es are roughly nailed together, the boards project aboutone-sixteenth of an inch beyond the end. This projecting rough-sawededge is by my machine planed oft flush .with the end of the box.

The nature of my invention consists in arranging two planes to run inguides independent of each other, and connecting them to the drivingshaft by cranks on opposite sides, whereby the heavy moving partsbalance each other, and a high rate of speed can be maintained.

It also consists in movable gages operated by adjusting-screws; also, inan iron strap which passes around the plane-bit.

A is one of the planes, having wooden crossbars at the top and bottom,which slide between the guide-bars 0. These guide-bars are boltedtogether, with a paper packing between them, and secured to the frame D.A

The pitman or connecting rod E is jointed to the bottom of the plane at6, The opposite end passes below the floor N to the crank-pin F. Theplane a is mounted in a similar manner and connected to the crank-pin F.These crank-pins are on opposite sides of the shaft h, which shaft iscarried in the bearing K. The bearing K is forked to receive thedrivingpulley L, which is driven by a belt from the pulley M.

The boxes are fed to the machine upon the table P, and to guide them tothe proper position against the plane-bit I have guides R r, operatedsidewise by the screws S S passing through the fixed nuts S S. By theseguides,

in conjunction with beveled bits, the out can be adjusted light or heavywithout stopping the machine or changing the knife.

The box is laid on the table on its bottom, and brought against theguide 1", and pushed against the plane a The plane-bit is ground withits cutting-edge on a bevel, as shown in Fig. 6, and is placed with itsprojecting point next to the guides R r. The face of the plane isconsiderably wider than the bit, so that the end of the box will comeagainst the face of the plane, as a stop, as soon as the rough edge isplaned off.

The beveled edge of the bit cleans ofl the end of the board at a slightangle without marking the flat end of the box. As soon as one edge isplaned off the box is shoved across against the guide It, then turnedover upon its side, then shoved across back to plane A, and theoperation of trimming one end is completed.

In planes for trimming boxes the bit V is set into the plane at a moreacute angle than is usually common. This makes the wood immediatelybehind the bit very thin and liable to be pressed out of shape.

To overcome this I make the plane with an iron strap, V. (See Figs. 3,4, and 5.) The strap is bent to the form of three sides of a rectangle,and passes behind the plane-bit, and between it and the ironfacing-plate V The plane-bit is secured by a clamping device con sistingof a lever, a, pivoted centrally at a to the strap V. A screw, a, passesthrough this lever, by turning which the bit is clamped at the top andbottom. It can thus be accurately set with great facility. 'I also cutaway or hollow out the middle of the plane, to make all the moving partsas light as possible.

By this construction, and running the planes independently, I avoid theunbalanced momentum due to a gang of planes in a heavy frame. Themachine can be run twice as fast and do twice the work of any heretoforein use. The machine is also on a standing balance-of some importancewhen changing plane-bits;

I claim- 1. In a box-trimming machine, the sliding planes A c operatedindependently by con strap V, lever a and set-screw a, the said leverbeing pivoted to the strap at a and the plane being provided with a bithaving a cutting-edge at an angle to the sides of the plane,substantially as specified.

JOHN BOZORTH.

Witnesses:

JOHN F. GRANT, EDWD. BROWN.

